Credit Card skimmers can be found at gas station pumps, ATMs or video rental boxes.  Most current skimmers target the magnetic strip instead of newer chip technology credit and debit cards.  The PIN may also be stolen, so it is safer to use a debit card as a credit card without entering the PIN.

ZDNet reports that the Bluetooth skimmers usually broadcast under the name “HC-05” with password “1234”, or appear with a name consisting of a long string of numbers.  To search for potential skimmers, open Settings on your cellphone, enable Bluetooth, and scan for devices.

Skimmer Scanner is an Android app that detects card skimmers and is available at the Google Play Store or at GitHub.